Draft: fix division by zero and count is zero for path arrays

Fixes #16468.

src/Mod/Draft/draftgeoutils/geo_arrays.py

@@ -64,8 +64,9 @@ def get_init_values(path, count=6):
     edge = path.Shape.Edges[0]
     edge_length = edge.Length
 
-    step = edge_length / (count - 1)
-    inc = 360 / (count - 1)
+    n = (count - 1) if count > 1 else 1
+    step = edge_length / n
+    inc = 360 / n
 
     return norm, edge, step, inc
 
@@ -84,6 +85,9 @@ def get_n_params(edge, number, step, norm):
 
 def get_twisted_placements(path, count=15, rot_factor=0.25):
     """Get the placements of the twisted array elements."""
+    if count < 1:
+        count = 1
+
     (norm, edge,
      step, inc) = get_init_values(path, count)
 

src/Mod/Draft/draftobjects/patharray.py

@@ -475,14 +475,19 @@ def placements_on_path(shapeRotation, pathwire, count, xlate, align,
         end = endOffset
 
     cdist = cdist - start - end
-    step = cdist / (count if (DraftGeomUtils.isReallyClosed(pathwire) and not (start or end)) else count - 1)
+    if count < 1:
+        count = 1
+    n = count if (DraftGeomUtils.isReallyClosed(pathwire) and not (start or end)) else count - 1
+    if n == 0:
+        n = 1
+    step = cdist / n
     remains = 0
     travel = start
     placements = []
 
-    for i in range(0, count):
+    for i in range(count):
         # which edge in path should contain this shape?
-        for j in range(0, len(ends)):
+        for j in range(len(ends)):
             if travel <= ends[j]:
                 iend = j
                 remains = ends[iend] - travel